Electric drill



R. Z. FARMER.

ELECTRIC DRILL.

APPLICATION FILED 1mm, 1920.

R. Z. FAHMER.

ELECTRIC DRILL. APPLICATION FILED 1mm, 1920.

1,358,303, Patented Nov. 9, 1920. I

2 SHEETS-SHEET 2 a T 1, 2; Q9 Q/ I 95 2/ 2 n1) 11 o UNITED STATES PATENT OFFICE.

nonnnrz. FARMER, or BOSEBURG, OREGON.

ELECTRIC DRILL.

Specification of Letters Patent.

Patented Nov. 9,1920.

Application filed January 31, 1920; Serial No. 355,378.

T all whom it may concern.

Be 1t known that I, ROBERT Z. FARM-n11,

a citizen of the United States, residing at' chines, andparticularly to motor operated drills.

The general ob ect of my invention is to provide a drill of an improved character which is compact in form and thoroughly effective in use. 1

And a further object is to providea construction of this character wherein a motor is used with the drill and forming part thereof, and wherein the drill is subjected to .a continuous rotary motion and to the impact of a very rapidly operating hammer disposed in the casing of the drill and driven by the motor.

A further object is to provide a drill of this character with improved means whereby water or other liquid'rnay be fed to the drill and discharged therethrough as the drill operates, and in this connection to pro vide a motor operated pumping means for forcing the water through the drill.

Other objects will appear in the course of the following description. 1

My invention is illustratedinthe accompanying drawings, wherein 1- Figure-1. is a side elevation of a drill constructedin accordance with my invention;

Fig. 2* is a longitudinal the drill shown in Fig. 1;

Fig. 3 is a-section on sectional view of the line 3-3 of Fig. 2;

Fig. 4 is a section on the line i--4 of Fig. 2; Fig.7 5 is a fragmentary enlarged longithe forward end of the drill casing showing the latch; 7

Fig. 8 is aside view of the tappet and a portion of the hammer-5 Fig. 9. is a section of the inlet valve to cylinder 41;

. side elevation of Fig. 10 is a sectionalviewof the inlet valve from cylinder 41 into chamber 34:.

Referring to these drawings, itwill be seen that the casing of my drill is, generally speaking, cylindrical, though 'it may-be of any suitable form, and'thiscasing'is formed in three sections 10, 11 and 12, thesesections being flanged andheld to: each other longitudinally extending bolts 13 which tend through perforations in the flanges and are providedwith sprmgsl l. I The rear section 1 2' constitutes a housing for anel'ectric' motor, designated generally 15;, and the armature shaft 16 of this motorextends longitudinally in suitable bearings throughgthe casing formed of the sections 10,111 and 12, in the manner illustrated in Fig. 1, and carries upon it the worm 17 disposed in'the: rear portion of the section 10: Mounted in suitable bearings: withinthe section 10 and extending through the section 11 is a rota-. table sleeve 18 carrying uponit a gear wheel the section 11 is approximately .conoidal in form, the axis-of the cone beingeccentric to the cylindrical section 10, and'the apex of the cone is open and provided with an in wardly projecting wall 21 forming a bear:

mg for the forward end of the sleeve 18,

Disposed within the forward 'portion of the.

sleeve 18 and rotating therewith is a drill chuck 22 which is tubular for a portion of its length and at its forward end is provided with the tapered nipple 23. Adapted to be disposed within the forward end of the.

tending lug 29 to prevent the detachment. of the latch bar 26 therefrom. The middle portion of the latch bar is arcuate. in form soas'to surround the drill and when it is in place rests in front of the protuberant portion 25, thus holding the drill from detach ment. lvhon the/latch bar is lifted, how

ever, the drill can be removed from the sleeve.

Disposed rearward of-the drill chuck 22 and slidably disposed within the sleeve 18 is a steel bar forming a hammer and coacting with this bar is a tappet 31 having two arms. This ta'ppet is mounted upon a transverse shaft'32 supported in hearings in the section 10, and the shaft is provided with a worm gear wheel 33 with which the worm 17 engages, It will thus be seen that as the drill isrrotated, it will be subjected to very rapidly repeated blows by the tappet.

For the purpose of supplying water tow the hollow drill, I form the forward end of the section 10 to provide two chambers 34 and 35 connected by a circular duct 36,-as illus-.

trated in Fi 3. The sleeve 18 is formed w th an opening ojrport 37, and the chuck member 22 is also formed with a port 38 which leads to the longitudinally extending bore of the chuck member. Preferably, the

. port .38'terminates at its exterior in arela ward movement of the piston, this water and tively long'slot 39 so as to permit the chuck to have a slight oscillation without communication between the cham ber 35 and the interior of the drill being broken. The cham- -"ber 34:, illustrated in Fig. 2, communi cates by ZtPOIllAO with a pumping chamber or cylinder 41 disposed within the section 1 10, thi chamber in turn'commu'nlcatm'g by a port 42 with a pipe leading-to a source of water or other liquid. Check valves are disposed within the ports 41 and 42. (See Figs. 9 and 10.) Operating within the cylinder is a piston 43 carried by a piston rod which is reciprocated by means of an eccentric as mounted on the shaft 16. Upon the inward movement of the piston, water is drawn into the cylinder, and uponthe outforced into-the chamber 34 so that there is a constant pressure of water within the chamf ber 34, and water will thus be forced under pressure into the hollow bore of the drill.

Preferably the casing of the drill is has a rounded face on one side and strikes I against the end face of the steel hammer 30.

In the operation of this device, the drill will be continuously rotatedby means of the gearing heretofore described, and at the same time the drill will receive the impacts ofthe tappet, the concussion of the drill as it strikes a stone or other work causing it to spring back again into position to receive another blow of the tappet.

The side rod springs 14 are designed to' take the shock off the front head in case the drill is not brought up against the rock to prevent breaking out this front head in case themachine is started with no drill in the drill chuck, the hammer 30 in the latter case forcing the member 22 to strike against the member 26 and thustransmittingthe shock to the front head of the machine. Also if drillingis being done and the driller failed to crank the machine up against the bottom of'the hole, that is to feed the machine as fast as the drill is cutting, then in that case the hammer 30 would strike s uare a ainst the member 22 and thus transmit its blow to the drill. The blow would be taken up by the front head of. the machine, and the springs 14: would save the hammer from breaking the front head, and it is to be understoodthat the part 26 not only acts as a clamp holding the drill. in place, but as a drill extractor acting to pull outthe drill when the machine is retracted after a hole signed to take the place of an ordinary air "drill, and thus eliminates the. high pressure air tank and water tank .with the lengths of hose which feed the drill. This high pres-' sure air tank and the hose are very eXpensive and very ClllllCllll) to handle under ground. To operate one air drill and supply it with. water takes one twenty-five horse power engine and one compressor to furnish 130 of air per minute, while with the same amount of horse power it would be'possible to operate six of the drills herein described.

It will be obvious that the several sections of the drill may be readily disassembled from each other whenever necessary, and the parts may be readily assembled. By the mechanism which has been described, I secure a drill in which the drill proper is very rapidly and continuouslyrotated, while at the same time itis rapidly truck by the tappet, and I thus provide a drill which is effective for certain kinds of work and may be used as a mining drill, rock drill and in work of like character. I

1. A drill of the character described including a rotatably mounted, longitudinally removable drill chuck, motor operated means for continuously rotating the chuck, a hammer disposed behind the chuck, and a motor operated tappet coacting with the hammer.

2. A drill of the character described comprising a casing, a motor operated shaft therein, a drill chuck mounted for rotary movement and for longitudinal movement, means on said shaft for rotating the drill chuck, a transverse shaft carrying a tappet, means for driving one shaft from the other, and a hammer disposed behind the chuck and adapted to be struck by the tappet.

3. A drill construction of the character described including a casing, a motor mounted therein and having a longitudinally extending shaft mounted in bearings in the casing, a sleeve rotatably mounted in the casing, a drill chuck carried by said sleeve and rotatable therein and longitudinally movable, a hammer mounted in the sleeve rearward of the drill chuck and adapted to impact thereon, means for transmitting the motion of the motor shaft to the sleeve to rotate the latter, a transversely extending shaft carrying a tappet coacting with said hammer, and means operatively connecting the motor shaft to the trans verse shaft to cause the rotation of the latter.

4. A drill including a hollow drill chuck, adapted to receive a drill, the drill chuck being mounted for rotary and longitudinal movement, a hammer disposed rearward of the drill chuck, motor operated means for rotating the drill chuck, a tappet coacting with the hammer, motor operated means for driving the tappet, and means for feeding water to the drill chuck.

5. A drill including a hollow drill chuck adapted to receive a drill, the drill chuck being mounted for rotary and longitudinal movement, a hammer disposed rearward of the drill chuck, motor operated means for rotating the drill chuck, a tappet coacting with the hammer, motor operated means for driving the tappet, and means for feeding water to the drill chuck, said means including a chamber through which the drill chuck passes, the chuck having a port opening into said chamber, a cylinder having a port opening into the chamber and the port having a check valve, and a piston operatively connected to the shaft to be reciprocated thereby.

(S. A drill of the character described comprising a sectional casing having an opening at one end, a sleeve disposed in said opening, a hollow chuck disposed in the sleeve,

the chuck and sleeve being rotatable, the chuck being longitudinally movable, the chuck and sleeve having alining ports leading to the hollow interior of the chuck, the chuck at one end having a nipple adapted to be inserted in the bore of. a drill shank, a water chamber mounted in the casing through which the chuck and sleeve pass and into which said ports open, a motor carried in the casing and having a longitudinal shaft, a pumping cylinder having an inlet port and having a port leading into said water chamber, a piston disposed within the cylinder, an eccentric on the shaft operating the piston, a gear wheel on the shaft, a gear wheel on said sleeve meshing therewith whereby the sleeve is rotated, a transverse shaft having a worm gear, a worm on the motor shaft meshing with said worm gear, a hammer disposed within the rear end of the sleeve and reciprocating against the rear end of the chuck, and a tappet mounted upon the transverse shaft and having a plurality of arms engaging the hammer.

7. A drill of the character described including a rotatably mounted drill chuck, motor operated means for continuously operating the chuck, a hammer disposed behind the chuck, and motor operated means for delivering blows upon the hammer.

8. A drill of the character described including a casing, a drill chuck rotatably mounted at one end "of the casing, motor operating means for imparting continuous rotation to the chuck, a hammer disposed behind the chuck and motor operating means disposed within the casing for delivering blows upon the hammer.

9. A drill of the character described including a casing, a rotatably mounted drill chuck carried in one end of the casing, a motor disposed within the casing, operative connections between the motor and the drill chuck for continuously rotating the chuck, a hammer mounted for free reciprocation in line with and behind the chuck, means operated by said motor for delivering blows upon the hammer while the chuck is being rotated, and means for feeding water to the chuck, including a pumping device, and means operatively connected to the motor for operating the pumping device.

In testimony whereof I hereunto afiiX my signature.

ROBERT Z. FARMER. 

